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星载测雨雷达探测频段选择仿真研究
引用本文:吴琼,杨虎,卢乃锰.星载测雨雷达探测频段选择仿真研究[J].气象学报,2011,69(2):344-351.
作者姓名:吴琼  杨虎  卢乃锰
作者单位:1. 中国气象科学研究院,北京,100081;国家卫星气象中心,北京,100081
2. 国家卫星气象中心,北京,100081
基金项目:国家自然科学基金,国防科工局项目
摘    要:在星载测雨雷达必须满足的3个基本条件的基础上,开展了风云三号(FY-3)星载测雨雷达最佳波段组合的研究.文中将高精度GCE(Goddard cumulus ensemble)模式中BOB飓风资料的大气廓线和水凝物廓线作为三维Quickbeam气象雷达模拟软件的输入,分别模拟了5、10、14、35和94 GHz 5个频点...

关 键 词:星载测雨雷达  GCE模型  反射率因子  Quickbeam雷达模拟软件
收稿时间:2009/7/16 0:00:00
修稿时间:2009/11/22 0:00:00

A simulation research on the wave bands selection of a satellite borne rain measuring radar
WU Qiong,YANG Hu,LU Naimeng.A simulation research on the wave bands selection of a satellite borne rain measuring radar[J].Acta Meteorologica Sinica,2011,69(2):344-351.
Authors:WU Qiong  YANG Hu  LU Naimeng
Affiliation:Chinese Academy of Meteorological Sciences, Beijing 100081, China; National Satellite Meteorological Centre, Beijing 100081, China,National Satellite Meteorological Centre, Beijing 100081, China and National Satellite Meteorological Centre, Beijing 100081, China
Abstract:Based on the three basic requirements which should be met by a satellite-borne rain-measuring radar, researches on the combination of the soundest wave bands for FY 3 a satellite borne rain-measuring radar have be made. The profiles of hydrometers and gases output by the high precision three-dimensional (3D) Goddard cumulus ensemble (GCE) model are used as the input of the Quickbeam radar simulation software. The detection nature for the five frequencies of 5, 10, 14, 35 and 94 GHz is discussed. To obtain a sufficient dynamic range in the near surface layer, it is necessary to select a lower frequency. Under the restrictions of the existing antenna hardware and the current technology level, 5 and 10 GHz are unpractical to be selected as the frequencies of the satellite-borne radar. The contrast analyses of the measured radar reflectivity factor and the effective reflectivity factor in three different typhoon areas show that there is an increasing attenuation with increasing high frequency. So, 94 GHz can t be used to detect rain. However, a high frequency has a better sensitivity to light rain and can make up the sensitivity deficiency of low frequency; so, a high frequency can be employed to detect light rain. Finally, according to the frequency allocations determined by the International Frequency Registration Board, the Ka and Ku bands should be chosen and 13.40-14.00 GHz in the Ku band and 35.50-35.60 GHz in the Ka band should be the soundest wave bands combination. The Ku band is valid for detecting heavy rain while the Ka band is valid for detecting light rain. The bands of Ku and Ka can be connected to improve the precision of precipitation retrieval.
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